2018
DOI: 10.1103/physrevapplied.9.034011
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Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication

Abstract: Quantum computing architectures rely on classical electronics for control and readout. Employing classical electronics in a feedback loop with the quantum system allows to stabilize states, correct errors and to realize specific feedforward-based quantum computing and communication schemes such as deterministic quantum teleportation. These feedback and feedforward operations are required to be fast compared to the coherence time of the quantum system to minimize the probability of errors. We present a field pr… Show more

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Cited by 75 publications
(39 citation statements)
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References 111 publications
(166 reference statements)
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“…Our comparison with Pauli frame updating provides evidence for potential advantages of real-time feedback control for quantum error correction by avoiding errors due to relaxation of the ancilla qubits, a topic to be further investigated. We find the measured steady state fidelity to be mainly limited by decoherence during the feedback delay time of 1 µs, which we expect to further decrease in the future by reducing the latency of feedback electronics [36] and the readout duration [51][52][53][54]. Our results constitute an important step towards the realtime stabilization of entangled multi-qubit states beyond Bell states using higher-weight parity detection [32,33] as required, for example, in quantum error correction codes such as the Bacon-Shor code [55] and the surface code [8,9].…”
mentioning
confidence: 88%
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“…Our comparison with Pauli frame updating provides evidence for potential advantages of real-time feedback control for quantum error correction by avoiding errors due to relaxation of the ancilla qubits, a topic to be further investigated. We find the measured steady state fidelity to be mainly limited by decoherence during the feedback delay time of 1 µs, which we expect to further decrease in the future by reducing the latency of feedback electronics [36] and the readout duration [51][52][53][54]. Our results constitute an important step towards the realtime stabilization of entangled multi-qubit states beyond Bell states using higher-weight parity detection [32,33] as required, for example, in quantum error correction codes such as the Bacon-Shor code [55] and the surface code [8,9].…”
mentioning
confidence: 88%
“…Repeated parity detection was also achieved for the cat code [34].In most previous implementations of ancilla-based parity detection, changes in the measured parity were accounted for in post-processing rather than actively compensated for using feedback. Conditional feedback, however, was previously used in superconducting circuits to arXiv:1902.06946v2 [quant-ph] 20 Feb 2019 2 initialize and reset qubit states [35,36], to demonstrate a deterministic quantum teleportation protocol [37], and to extend the lifetime of a qubit state encoded as a cat state in a superconducting cavity [20].Here, we report on the experimental realization of repeated XX and ZZ parity detection of two superconducting qubits. In contrast to previous experiments in superconducting circuits, we perform real-time conditional feedback to stabilize the data qubits in a Bell state and to actively reset the ancillary qubit to the ground state, see Fig.…”
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confidence: 99%
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“…In general, this includes signal demodulation, filtering, decimation, signal integration and state discrimination. Special techniques can be used to bring down the latency, such as using frequency-selective kernels to combine the demodulation, filtering and integration in a single processing stage [76], or using digital mixing and multiplier-less filters [77].…”
Section: Tailor-made Room-temperature Controllersmentioning
confidence: 99%
“…Examples include enabling deterministic one-way optical computing [20][21][22][23], improving the single-photon probability of heralded single-photon sources without increasing the multiphoton pulse probability [24][25][26][27][28][29][30], reducing light intensity in quantum sensing [31], and enabling deterministic quantum teleportation [32][33][34]. For applications in quantum computing and quantum communications, the latency of the measurement and feedforward mechanism are important considerations, especially if multiple iterations of the mechanism are required [35].…”
Section: Introductionmentioning
confidence: 99%